Blackwell wrote Callender-Scott a series of heartfelt letters, the court heard

She also phoned him around 115 times, with some calls lasting more than two hours and being sexual in nature, according to the Crown Prosecution Service.

After the male inmate's phone was seized during a cell search at Aylesbury Young Offenders Institution in Buckinghamshire, Blackwell used a second "dirty phone" to make five calls.

The court heard that the guard, now 27, thought they would become a couple after his release, and she wrote him a series of letters which were later found in his cell.

A forensic handwriting report concluded there was "very strong evidence" that Blackwell had written all of them.

Although they were not read out to the court, prosecutor Mr Richard Mandel said her letters proved she was "infatuated" with Callender-Scott.

The prosecutor added: "There were attempts to contact or make calls to the prisoner's number after the phone was seized from him so she was completely unaware of what had happened in terms of his cell being searched.

Blackwell initially registered a conflict of interest relating to her relationship with the inmate in December 2015. But after she was moved to a different wing at the start of 2016, she often went back to where the inmate was staying

"Some of the texts make it really clear that she was infatuated with this prisoner and contacted him - and he contacted her often on a very frequent basis."

Blackwell's love interest had been jailed for seven years for wounding with intent.

Blackwell's inappropriate relationship with the inmate was revealed at the end of 2015

Before their relationship was revealed, Aylesbury Crown Court heard that Blackwell registered a conflict of interest relating to her relationship with an inmate and was moved from "A wing" - where Callender-Scott was - to "E wing".

Although she could not help but go back and visit her old wing from time to time.

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Before admitting her relationship, Blackwell initially denied the charge against her in court.

She told police officers during two interviews that the evidence must have been planted by her colleagues.

But last month she pleaded guilty misconduct in a public office, was sentenced to eight months imprisonment on August 3 and was ordered to pay a victim surcharge of £140.

Pictured: Chelsea Blackwell, who was sentenced to eight months in prison last week, after she pleaded guilty to misconduct in a public office

Senior Crown Prosecutor Louise Attrill said events like this are "extremely rare".

Judge Catherine Tulk said 25 per cent of the prisoners in the institution were involved in organised crime while half were involved in some form of gang-related activity

After the sentencing, police constable Nicola Ambrose said: "Blackwell completely abused her position as a prison officer, by choosing to communicate with a serving prisoner through letters, texts and calls knowing that he illegally had a mobile phone inside prison.

"Her actions were completely unacceptable and amounted to misconduct in a public office."

In June, The Sun revealed how dozens of prison officers were caught sharing “inappropriate relationships” with jailbirds.

Ministry of Justice figures show 43 guards have been punished for being too close to an inmate in the past three years.